Heater



April 14, 1925 1,533,845 J. s. FORBES HEATER File d May 5, 1923 4 Sheets-Sheet 1 J. S. FORBES April 14, 1925.

HEATER Filed May 3, 1923 4 Sheets-$heet 2 ll muwwp ZwaW III April 14, 1925.

Filed May 3, 1923 4 v Sheets-Sheet I 3 April 14, 1925. 1,533,845

J. S. FORBES HEATER Patented 14-, 1925,

tenan- JOHNS; scenes; or ovnnnno'on; PENNSYLVANIA."

HEATER.

Application filed May a, 1923; Serial no. 636,402.

To (ZZZ whom it may] concern J Be it known that I, Joi-iN S; Fonnn's, acitizenot the United States, residing in ()Ven brook, Pennsyli'ania, have invented a Heater, of which the following is a specifihation'; 7 v t 1 A i. I l v i I i One ob ect of this invention 13 to provide a convenient economical and compact form of heater particularly adapted for heating" sniallr'oonis. A further object of n'iy invention is to provide a convenient andetiicieiit' devicetor heating or drying objects requiringa relatively mild degree of heat, and

said invention especially contemplates the provision of a convenient and inexpensive form of heating; shelf, together with novel means for supporting this in either of two adjusted positions.-

Another object of the invention is to pronot aiheating plate with noi' 'el means for mainta' ingitat any of several diiterent temperatures, the invention including also novel means for conhecting the several parts o'l thedeviceso that these may be'e'asil'y and quickly assembled and inspected;

These obj I attain as hereinafter set forth, reference being had to the accompanying drawings, in which,

1 1 and 2 v lustratingnly heater with its'adjustable e1elimit in its lowcredand' raisedpositions, re-

spectively; i V a Fig: 3 a perspective View of the main simpor'ting' trains for my heater;

Figs. a undo-areperspective views respective y of the front and-rear o'f'the'bac'lc plate which forms a part of my app ar'atus i i (3 a vertical section on the line Figs. 7 and 8 are perspective views of the trout and back times of the plate whiclican ries the lieati 11g elementsand the stun-Lures associated therewith;

Fig. 9 is a perspective view of the taco plate ot my heater;

Figs. 10 and 11 are use, inconnection \vithfmy heater;

F 1g. 12 is a diagrai'i'i illustrating the elec.

trical connections of" the heating elements and controlling switch tormin'gpart' of' my ectsandother advantageous ends are perspective views il I perspective views ('Lilthlill ot the protecting sheets pr'efeably cal section, illustrating the detail constructi met one otthe electricalheating elen'ients;

Fig; latis'a detachedperspective View further illustrating the preferred construction ott'he' heating element;

Fig. 15 is a perspective yiewot' one of the connectors for the heati coils;

Fig. 1G is aperspective' view illustrating my heater as adapted to use gas instead of electricity Fig: 1? is a vertical section on the line 17 17, Fig. 16;

Fig. 18 is a perspective view of thesup porting frame for that form otiny heater shown in Fig. 16; I Figs. 19 and' 20 are perspective viewsih lustr'ating the front and rear faces of the back plate for the gas heated form of my invention;

Figs. 21 and 22 are perspective views of the front and rear faces of the plate carrymg the gas burner a-ndits associated'parts; and; I

Fig.2?) is :1 perspective View of baffle. plate forming part of the structure shown in Fig.-17. p

In the above drawings and referring to Figs. 3 and (3, 1-l are'twoparallel and'ver tically mounted lengths of angle iron joined at the-irnpper ends by across bar 2 having projecting extremities forwardly offset from the plane of the bacli of the angle irons 1- 1. The lower ends ofthe latter are cut away for a' suitable distance'and the extremities of their bodies are turned. up to form hooks Carried by andifixed to the. angle 9 irons 11'of the-frame is a block 4 or insulating inate'rial carrying a pair of contact. clips 5 -5 having; terminals 6 and 7 for connection to apair of conductors leading from any suitable source of electrie current.

The name fori'ned'hy the elements l -1 is designed to suppoit a'liiacli plate 8, (F O i 41- and preferably inade ot sheet or cast ineta'l'having' an edge flange and of a gen-- erally rectangular shape. This back p ate has on the upper part of its rear face a pair of lugs 99 designed" to fit back ot the oil'- set ends of the crossbar 2, so as to hoid said plate to its supporting frame, whichis thus completely enclosed thereby. The lower part of the'fhacl; plate 8 has fixed to it in any suitable manner a cross bar 10 having otl'set, ends designed to fit into the hooks 8 so that said plate and the structures carried by it may be removably mounted on the frame 1-1-2 by the simple operation of engaging the lugs 9-9 and ends of the cross bar 10 with the cross bar 2 and hooks Adjacent the center of the back plate 8 is an opening 11, whose lower part is designed to receive the forwardly projecting insulating block 1 with its fuse terminals 5 and 6. In addition I provide a second insulating block 12 mounted on the back plate 3 so as to project through the upper part of the opening 11. This second block 12 carries a pair of contact clips 13-13, respectively aligned with the clips 5-5 and immediately adjacent the same in such positions that suitable cartridge fuses may be mounted in and caused to electrically connect each of the clips 5 with. one of the clips 13.

The back plate 8 has projecting upwardly from. its top edge an extension 14: on which is mounted a suitable multi-point switch 15, and as shown in Fig. 12, one contact 16 of this switch is connected through a conductor 17' with one of the fuse terminals 13. The other three terminals 18, 19 and 20 of said switch are connected to three heating coils 21, 22 and 23 in the manner indicated in Fig. 12 and as hereinafter explained.

From the upper part of the front face of the back plate 8 projects a pair of bearing lugs 2 1-24 having recesses for the reception of pivots or trunnions 25-25 forming part of or suitably fixed to the rear face of a rectangular flanged plate 26 having substantially the same general outline as the back plate 8, to which it is movably connected by aid trunnions. On the front or outer face of this plate 26, I mount two parallel outwardly projecting members 2. 27 of channel section serving to support three heating elements 22f and 23, respectively including the coils 21, 22 and 23. As shown in Figs. 13 and 14, each of the heating elements includes a core 28 of re fractory material such as porcelain, lava or the like, on which the wire 21 to be heated, is wound preferably in a helical groove. At each end the core 28 has mounted upon it a refractory bushing 29 and the two bushings of each core carry coaxially therewith a suitably perforated cylindrical protective casing St) usually of sheet metal. As shown in llig. lei, each. of the ends of the core 28 is formed with a lo]igitudinally exteiuliug slot 31. designed for the reception of the inwardly turned end 32 of a split sheet metal sleeve 33 whose opposite end 34E is rolled up to form a tubular channel for the reception of the end of the winding 21. When said sleeve 33 is applied to the end of the core 28 with its inwardly turned end 32 in the slot 31 thereof, the end of the winding on said core will be extended through the rolled up end 3% and thus electrically connected to the sleeve, which constitutes a terminal for said winding projecting outside of the refractory bushing 29.

- For the purposes of my invention, an end of the winding 23 of one heating element is electrically connected to the adjacent end of the winding 22 and the second end of the latter winding is likewise electrically con nected to one end of the winding 21. For this purpose, I provide metallic strips 35 (Fig. 15) having their ends formed to receive and be clamped upon the sleeves 33. As shown in Fig. 12, the strip connecting the windings 22 and 23 is connected to the terminal 19 of the switch 15 and the strip connecting the windings 21 and 22 is similarly connected to the terminal 20 of said switch. The free end of the winding 21 is connected to one of the fuse clips and the free end of the windings 23 is connected to the switch terminal 18.

For the purpose of connecting the heating elements on the plate 26 with the switch on the fixed plate 8 so as to permit relative movement of the former, I lead the couductors from said elements through a pair of oppositely disposed holding blocks 36 on the upper part of the rear face of the plate 26, extending said conductors from said blocks in two parallel pairs toward and into a receiving block 37 at the middle of the front face of the back plate 8 which is pro vided with passages from which said conductors run to the fuse clips 13 and to the switch 15. Between these blocks 36-37-36, the conductors run immediately adjacent to and parallel with the pivotal axis of the trunnions 25, so that the plate 26 may be swung through an angle of substantially 90 from a vertical to a substantially horizontal position without injury to said conductors or interference with the supply of current to the heating elements. 7

As shown in Fig. 7, the front face of the plate 26 which carries the heating elements, has four hook-like lugs 40 preferably placml adjacent its corners. These are designed to receive suitable projecting lugs -1H. on the flanged cover plate -12 so as to removably support the same in such position as to en close the heating elements and their supporting structure. This plate 42 is preferably .luade of highly polished or enameled sheet or cast metal, and as shown in Figs. 1 and 9, is fornuad with a series of openings 4-3 in its top side. This cover 42, with the heating elements and their supporting plate 26, are free to be swung on the bearings 24t2 1 from the substantially vertical position as shown in Fig. 1, to the position shown in Fig. 2, in which the extended flat outer face of said cover is horizontal, and for the purpose of maintaining said parts in this latter position, I provide two pairs of joined bars or links 14-+t5, of which the link s l l are respectively pivoted or liinged to l'ugs a6 onthe rear face of the plate'26, while the links" are respectii ely' pivoted or hinged to ltigson the lower part} of theback plate 8'. Thebars 4E4 areeach pro vided with a suitable projecting stop or'liig 4:8 (Figsf 2 and inorder'toiiiaiiitain them in the extended positions"necessary'to lioltl the'cover 4-2 in its horizontal pos'iti'orii Aft" thesmnetime they permit said links" or bars to buckle and swingfronrtheii' extendedpo sitiions to parallel positions when" said cover" witlitlie heating coils'i's to m'ov'edt'othe vertical position.

11 order to'preveii't excessive heating of the flilu face of the'cover' 4;2, bytlieheating" certain conditions" (Figs; Ga'ndf with the above described an-an ement" of: nirts it? is obviousthat' the windings-21, 22" and 23 may be so supplied-with current as to givethree degreesioflieat, the switch 15 being provided with a movable contact or contactslnot shown) for accomplishiiigtliis end. With the parts in the positions illustrated in full linesinFig. 6, air is free to enter my heater at the bottom thereof and to flow upwardly between the cover 42 and the plate 26 around the heating elements. Thereby its temperature is raised to the desired point and it may flow out through the openings 43 of the cover. When used in this manner, the device acts chiefly as an air heater although heat is also radiated from the front and side faces of the cover Vhen the latter is swung upwardly in the position in dotted lines in Fig. 6, its extended flat face is available for dryingand heating small articles as Well as for heating hot applications, containers or other objects.

lVithout departing from my invention, I may utilize gaseous or liquid fuel as the heating agent for my invention which for this purpose is constructed as shown in Figs. it; to 23, inclusive. As before, I provide a supporting frame (Fig. 18) preferably including a cross bar 2 and at least one vertically extending bar 1 having a hook 3 at its lower end. This frame is designedfor attachment to a wall or other vertical sup porting structure and has detachably mounted upon it a flanged'back plate 8 having lugs 9 at its upper portion for en gagement with the offset ends of a cross bar 2 and having a cleat 52 at the middle of its lower portion which engages with the Upon tlieba'ek plate, as'befo1"e,lm0unt a heatingelemeidt carrying plate 26 including triifinions 25"" formed to rotatably engage bearing lugs 24- on'said back plate. On tlie' front of the plate 26 is mount ed any suitableform of burner 53 forliquid orfga'seous fuel and this is connected to a mixing chain'- ber 04: on the rear face of said; plate, adjace'n't which is mounted a fuel supply" pipe 55 extending from a suitable" source across" the front face of the back plate 8. This supply pipe terminates in a va'lv'e 56 whose casing isconnectedto deliver axially into the n'iixing" chamber 54 in tlie line of the triln'riions'" 25 and one of said trunnions is formed to constitute the controlling stein for said valve; for" which purpose it extends laterally through a* suitable opening in the cover 42" outside of which it is equipped with anoperating 'handle 57'. Ks'before, the cover 42 isli'u'ng' t'o thepla't'eon which-the heating means mounted", amt it may be adjusted from its vertical to its'liorizont'al position with the heatingelenicnts as previously described; being maintain'ed in said latter position by a pair of coacting links as and 45, connected between it and suitable lugson the back plate 8. Iii'asmuch as the valve 56andsupplycondliit' 55 remain sta tionary, while the mixing chamber oi swings with the cover 42 and plate 26,- tliereis no interference wiuitne'sappiy of" fuel and operation of the device, when the cover is adjusted from one to the other of its positions.

In order to prevent undue heating of the back plate and its associated parts, I preferably mount on the back 01f the plate 26 a shield 51, for which purpose said plate is supplied with suitable rearwardly pro- 1 5 jecting studs 60 on which the shield is carried. i

From the above description, it will be appreciated that the various parts of my device may be easily and quickly assembled or 1w separated as may be desired, their construction being simple, rugged and of such a general nature as to remain in serviceable condition without attention for long periods of time. Obviously, the temperature to which the cover a2 may be heated, or the temperature of the air delivered from the device, may be widely varied Without, departingfrom my invention by alterations in the design'and proportions of the heating ele ments, in order to suit my heater for various kinds of service;

I claim:

1. The combination in a heater of a supporting structure; a heat radiating plate hinged to and normally suspended from said structure and movable from a normal substantially vertical plane to a substantially horizontal plane; with means for maintaining said plate in the latter plane.

2. The combination in a heater of a supporting structure; a plate hinged to and normally suspended from said structure andlnovable from a normal substantially vertical to a. substantially horizontal position; and heating means attached to and movable with said plate.

3. The combination in a heater of a supporting structure; a heating plate hinged thereto and free to be moved from a normal suspended substantially vertical to a horizontal position; heating means movable with said plate; and means for maintaining the plate in a substantially horizontal position.

l. The combination in a heater of a supporting structure; a flanged plate hinged to and normally suspended from said structure and formed with openings for the passage of heated air, said plate having a flat relatively smooth face: heating means for the plate; and means for supporting the plate with its face substantially horizontal.

5. The combination of a supporting strue ture; a plate connected to said structure and adjustable from a vertical to a horizontal position; heating means carried by and movable with the plate; and conductors for the supply of heating medium mounted on the supporting structure and connected to the heating means on the plate; said conductors including portions extendin g in the line of the hinge between the plate and supporting structure.

6. The combination in a heater of a back plate adapted for wall mounting; a cover plate mounted thereon; heating means mounted on and enclosed by the cover plate: and means for movably connecting said plates.

7. The combination in a heater of a supporting structure; a substantially flat faced plate having a flange and connected to said structure with its flat face in a substantially vertical plane, there being openings through said plate for the passage of air; and heating means for said plate enclosed between it and the supporting structure.

8. The combination in a heater of a supporting frame adapted for mounting upon a vertical foundation; a back plate detachably mounted on said frame: a cover plate hinged to said back plate; heating means for the cover plate; and means for supporting said cover plate in a substantially horizontal plane.

9. The combination in a heater of a supporting frame; a back plate mounted on said frame; a cover plate connected to said back plate movable into and out of a sub stantially horizontal position; electrical heating means carried by said cover plate; and an electric switch on the back plate for controlling the flow of current to said heating means.

JOHN S. FORBES. 

